电光与控制, 2018, 25 (12): 73, 网络出版: 2018-12-17
闭环光纤陀螺温度误差分段补偿方法实现
Implementation of a Temperature Error Piecewise Compensation Method in Closed-loop Fiber-Optical Gyro
光纤陀螺 数字闭环 温度补偿 分段拟合 fiber-optical gyro digital closed loop temperature compensation piecewise fitting
摘要
针对数字闭环光纤陀螺工作过程中对环境温度变化敏感,易产生温度漂移的问题,提出了一种分段补偿方案。通过分析温度漂移产生的原因,在传统单模型拟合的基础上,推出基于新的分段策略的多模型拟合方法。模型分段拟合时,将整个范围的测温数据分为几个数据区,通过多重线性回归对每个区间估算参数。工程实现过程中,利用每秒采集光纤环中心的温度信号进行数据处理,并采用相应段的模型参数计算出补偿量,FPGA读取补偿量数据进行温度补偿。实验结果表明,该方案相对于单模型拟合具有更好的补偿效果,补偿后的陀螺全温误差比补偿前降低了一个数量级。
Abstract
A piecewise compensation scheme is proposed to solve the problem that the digital closed-loop fiber-optical gyroscope is sensitive to changes of ambient temperature in its working process, which may lead to temperature drift.By analyzing the causes of temperature drift, a multi-model fitting method is introduced based on a new segmentation strategy and the traditional single-model fitting method.In this method, the full-range test data is divided into several data areas, and the parameters in each interval are estimated through multiple linear regression.In its realization process, the microcontroller collects the temperature signals in the center of the fiber-optical ring in every second, which are used for data processing.The compensation amount is calculated by using the model parameters from corresponding segments.The FPGA reads the compensation data for temperature compensation.Experimental results show that this scheme has better compensation effects than that of the method of single model fitting,and the full temperature error of the compensated gyro is reduced by an order of magnitude, compared with that of the uncompensated gyro.
罗全, 秦琳琳, 周全, 吴刚. 闭环光纤陀螺温度误差分段补偿方法实现[J]. 电光与控制, 2018, 25(12): 73. LUO Quan, QIN Lin-lin, ZHOU Quan, WU Gang. Implementation of a Temperature Error Piecewise Compensation Method in Closed-loop Fiber-Optical Gyro[J]. Electronics Optics & Control, 2018, 25(12): 73.